Thermal insulation products -- Exterior insulation and finish systems (EIFS)

This document specifies requirements for the installation of exterior insulation and finish systems (EIFS) for wall applications using material which meet the materials requirements of ISO 17738‑1 and the design requirements of ISO 17738‑3. This document further includes installation requirements for the EIFS materials that include a water resistive barrier (WRB) and decorative projections as part of the cladding system for walls. This document does not include requirements for the structural design of the substrate/building structural members or for the integrity of the substrate/building structural members to which the EIFS is to be attached, nor the requirements for installation or repair of the substrate/building structural members before installation commences. This document does not include requirements for the competence that an EIFS installer needs for installation of the system. The installation of EIFS on horizontal surfaces exposed to direct precipitation is outside the scope of this document.

Produits isolants thermiques -- Systèmes de finition et d'isolation externe

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Publication Date
27-Aug-2019
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6060 - International Standard published
Start Date
01-Aug-2019
Completion Date
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INTERNATIONAL ISO
STANDARD 17738-2
First edition
2019-08
Thermal insulation products —
Exterior insulation and finish systems
(EIFS) —
Part 2:
Installation
Reference number
ISO 17738-2:2019(E)
ISO 2019
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ISO 17738-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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Published in Switzerland
ii © ISO 2019 – All rights reserved
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ISO 17738-2:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 General requirements ..................................................................................................................................................................................... 3

5 Materials storage and handling ............................................................................................................................................................ 4

6 Substrate ....................................................................................................................................................................................................................... 4

7 Mixing............................................................................................................................................................................................................................... 5

8 Installation of the liquid-applied water resistive barrier system ..................................................................... 5

8.1 General ........................................................................................................................................................................................................... 5

8.2 Transition membrane ....................................................................................................................................................................... 6

9 Thermal insulation boards ........................................................................................................................................................................ 6

9.1 General ........................................................................................................................................................................................................... 6

9.2 Attachment of the thermal insulation boards .............................................................................................................. 7

9.2.1 General...................................................................................................................................................................................... 7

9.2.2 Clearances (spacing)..................................................................................................................................................... 8

9.2.3 Rasping and surface preparation ....................................................................................................................... 8

9.3 Aesthetic reveals .................................................................................................................................................................................... 9

10 Installation of the base coat and glass fibre reinforcing mesh ............................................................................. 9

10.1 Attachment of the glass fibre reinforcing mesh .......................................................................................................... 9

10.2 Terminations and aesthetic reveals ...................................................................................................................................12

10.2.1 General...................................................................................................................................................................................12

10.2.2 Wrapped terminations.............................................................................................................................................12

10.3 Base coat surface ................................................................................................................................................................................17

11 Installation of the finish material ....................................................................................................................................................18

11.1 General ........................................................................................................................................................................................................18

11.2 Execution...................................................................................................................................................................................................18

Annex A (informative) Mechanical fasteners ............................................................................................................................................19

Annex B (informative) Site quality assurance programme (SQAP) ...................................................................................20

© ISO 2019 – All rights reserved iii
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ISO 17738-2:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use

in the built environment, Subcommittee SC 3, Thermal insulation products.
A list of all parts in the ISO 17738 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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ISO 17738-2:2019(E)
Introduction

This document provides minimum installation requirements for an exterior insulation and finish

system where the materials meet the requirements of ISO 17738-1, and where the installation meets

the requirements for design in accordance with ISO 17738-3.

Exterior insulation and finish systems (EIFS) are a unique insulated cladding that consists of a water

resistive barrier system (WRB) over the substrate, a drained cavity and an insulated cladding that is

bonded adhesively to the WRB, covered with a base coat, mesh and a finish material.

A risk management process may recommend additional requirements for the establishment of a site

quality assurance programme (SQAP). Additional information related to a SQAP is included in Annex B.

© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 17738-2:2019(E)
Thermal insulation products — Exterior insulation and
finish systems (EIFS) —
Part 2:
Installation
1 Scope

This document specifies requirements for the installation of exterior insulation and finish systems

(EIFS) for wall applications using material which meet the materials requirements of ISO 17738-1 and

the design requirements of ISO 17738-3. This document further includes installation requirements for

the EIFS materials that include a water resistive barrier (WRB) and decorative projections as part of

the cladding system for walls.

This document does not include requirements for the structural design of the substrate/building

structural members or for the integrity of the substrate/building structural members to which the EIFS

is to be attached, nor the requirements for installation or repair of the substrate/building structural

members before installation commences.

This document does not include requirements for the competence that an EIFS installer needs for

installation of the system.

The installation of EIFS on horizontal surfaces exposed to direct precipitation is outside the scope of

this document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 7345, Thermal performance of buildings and building components — Physical quantities and definitions

ISO 4624, Paints and varnishes — Pull-off test for adhesion

ISO 8873-1, Rigid cellular plastics — Spray-applied polyurethane foam for thermal insulation — Part 1:

Material specifications

ISO 8873-2, Rigid cellular plastics — Spray-applied polyurethane foam for thermal insulation — Part 2:

Application
ISO 9229, Thermal Insulation — Vocabulary

ISO 17738-1, Thermal insulation products — Exterior insulation and finish systems — Part 1: Materials

and systems

ISO 17738-3, Thermal insulation products — Exterior insulation and finish systems — Part 3: Design

requirements
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 7345, ISO 9229 and

ISO 17738-1 and the following apply.
© ISO 2019 – All rights reserved 1
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ISO 17738-2:2019(E)

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
aesthetic reveal
groove cut into the thermal insulation board for decorative purposes only
3.2
back-wrap

encapsulate the exposed edge of the thermal insulation board by securing a strip of glass fibre

reinforcing mesh (3.9) to the substrate and embedding it in base coat around the board edge onto the

face of the insulation
3.3
edge-wrap

encapsulate the edge of thermal insulation board by embedding a strip of glass fibre reinforcing mesh

(3.9) in base coat and lapping it onto the face of the insulation board and onto the edge of an opening

3.4
EIFS contractor

legal entity (corporate or personal) responsible for the site installation of EIFS

3.5
EIFS moulding

insulation profile that is mounted on or incorporated into the thermal insulation boards, covered by the

lamina integrated into EIFS
3.6
expansion joint

joint designed to permit movement due to expansion and contraction of any part of the system

Note 1 to entry: See ISO 9229.
3.7
flashing

continuous material(s) that stops the vertical flow of water within a wall assembly or system and

directs the water, via gravity, to the exterior of the cladding
3.8
pot-life

period of time that a material maintains its workable properties after it has been mixed

3.9
glass fibre reinforcing mesh

woven or non-woven glass fibre fabric material of EIFS that is encapsulated in the base coat to

strengthen EIFS
3.10
pre-wrap

encapsulate the exposed edge of the thermal insulation board with base coat and mesh, lapping onto

the front and back of the insulation board before installation
3.11
transition membrane

component of the WRBA (3.12) that maintains continuity of the WRB at joints and openings in the

substrate that cannot be bridged with the LA-WRB
2 © ISO 2019 – All rights reserved
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ISO 17738-2:2019(E)
3.12
water resistive barrier assembly
WRBA

materials possessing water resistant properties that are installed over substrates to create a continuous

drainage plane preventing water penetration into the wall assembly and draining that water to the

exterior of the wall cladding
EXAMPLE LA-WRB, transition membranes (3.11), flashing (3.7).
4 General requirements

4.1 For each project, the EIFS contractor shall obtain all the materials and components required for

the EIFS cladding from a single EIFS manufacturer.

4.2 The EIFS contractor shall incorporate the design requirements outlined in ISO 17738-3 into the

EIFS installation.

4.3 The EIFS contractor shall obtain information, in written or electronic form, from the EIFS

manufacturer, and shall keep this information at the project site:

a) Detailed description of the EIFS materials and components to be used for the specific project

installation.

b) Instructions for safe handling, use and disposal of the materials or components.

c) EIFS manufacturer’s installation instructions.

4.4 The EIFS contractor shall follow the EIFS manufacturer’s installation instructions throughout the

EIFS installation process.

4.5 Before commencing installation, the EIFS contractor shall verify that the materials and components

on site comprise the EIFS declared by the manufacturer as meeting the requirements of ISO 17738-1.

This can be accomplished by reference to a materials list or other documentation.

4.6 EIFS shall not be used at locations where the continuous service temperature exceeds +75 °C.

NOTE Service temperatures more than +75 °C can occur in proximity to chimneys, heater vents, steam pipes,

and materials of a dark colour that absorb solar radiation.

4.7 Materials and surfaces shall be protected from staining or damage by wet EIFS materials during

installation.

4.8 The installed EIFS shall be protected from water for a period required by the EIFS manufacturer.

4.9 EIFS shall be applied when:

a) the ambient temperature or surface temperature of the material is 4 °C or greater;

b) the ambient temperature or surface temperature of the material 40 °C or less.

4.10 When conditions are outside the requirements of 4.9 and protection (tenting, shading and

supplemental heat) is used, this protection shall be maintained:
a) for a minimum period of 24 h before installation,
b) during the installation of EIFS, and
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ISO 17738-2:2019(E)
c) for a minimum period of 24 h after installation.
5 Materials storage and handling

5.1 The EIFS contractor shall verify and record that all materials delivered to the project site are in

packages, containers or bundles that are individually labelled with the EIFS manufacturer's name, product

name, product description, ISO 17738-1, country of manufacture, and lot or date code identification for

the materials and components.

5.2 Materials that are visibly damaged, frozen, in any way defective, or that are past the EIFS

manufacturer's shelf life shall not be used and shall be promptly removed from the site.

5.3 Portland cement and other dry-mix components shall be protected, kept dry, kept off the ground,

under cover (in addition to the product's packaging), and away from damp walls and surfaces.

5.4 Thermal insulation boards shall be kept in their original packaging until installed. They shall be

stacked flat, fully supported, off the ground, and under a cover designed to minimize water and ultraviolet

radiation (UV) exposure, with care taken to avoid damage to edges, ends, or surfaces.

5.5 All materials shall be protected from prolonged exposure to excessive heat or cold. Liquid materials

shall be transported and stored such that the material temperature never falls below 4 °C or exceeds 65 °C.

6 Substrate

6.1 EIFS shall be installed on substrate consistent with the EIFS manufacturer’s allowable substrates,

as determined through ISO 17738-1 testing and specified in the contract documents.

6.2 EIFS shall be installed on a substrate that is firm, structurally sound, and undamaged. EIFS shall

not be installed on broken, cracked, rotted, decayed or delaminated substrate sheathing boards, nor on

loose, spalling or crumbing concrete or masonry unless repaired before the installation starts.

6.3 Newly constructed cast-in-place concrete and unit masonry substrates shall be allowed to cure

according to the desired strength before the installation of EIFS. Unless otherwise specified, curing time

shall be a minimum of 28 days. Repaired areas on existing (aged) walls shall cure for the 28 days, unless

the material used to repair is specifically designed to cure rapidly.

6.4 EIFS shall be installed on a substrate free of any surface contaminants that could affect the adhesion

of the EIFS, such as oil or grease, dust, form-release agents, curing compounds, paint, wax, glazing, water,

moisture, efflorescence, laitance, frost, etc. These contaminants shall be removed before commencing the

installation of EIFS.

6.5 All substrates shall be cleaned to remove loose dirt and dust using methods appropriate for the

project.

6.6 Efflorescence and laitance on concrete, masonry, stucco, or clay tile substrates shall be removed

prior to the liquid-applied water resistive barrier (LA-WRB) installation. All loose particles and cleaner

residue shall be removed by rinsing with tap water. The surface shall be allowed to dry prior to LA-WRB

installation.
6.7 Paint on concrete or masonry surfaces shall be removed.

6.8 The EIFS shall only be installed on dry substrates with no visible moisture such as condensation,

dew, or frost.
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ISO 17738-2:2019(E)

6.9 EIFS shall not be installed on a concrete or masonry substrate where there are unrepaired cracks

greater than 2 mm in width.

6.10 EIFS shall be installed on a substrate that is true in all directions to within 6 mm over 2 400 mm.

6.11 The substrate surface temperature shall be not less than 4 °C nor greater than 65 °C during the

installation, drying and curing of the LA-WRB, unless having demonstrated tolerance to such conditions

during ISO 17738-1 assessment.

6.12 The EIFS contractor shall visually confirm and record that the substrate is acceptable prior to

starting and throughout the installation of the LA-WRB. Installation of the LA-WRB shall not proceed if

the EIFS contractor deems the substrate unacceptable.
7 Mixing

7.1 Clean containers, free of foreign residue and/or materials shall be used when mixing materials.

7.2 Mixing shall be done with a clean, rust-free, corrosion-resistant paddle, mixing blade or other

equipment that minimize air entrainment with a rotational speed less than 500 r/min.

7.3 Determine the quantity of dry materials mixed by weight. Record the weight of the materials of

each batch mixed on site.
7.4 Use tap water that is free from deleterious materials.

7.5 Mix factory-blended liquid materials (LA-WRB, base coat, finish coat and primers) prior to

installation.

7.6 Only additives supplied or specified by the EIFS manufacturer and tested in conformance with

ISO 17738-1 shall be used.

7.7 Mix and install materials that cure or dry within the pot-life limitations. Mixing containers shall be

kept closed when not used.
8 Installation of the liquid-applied water resistive barrier system
8.1 General

8.1.1 Gaps of 2 mm or less do not need to be treated. Treat gaps greater than 2 mm but not greater

than 6 mm by filling with a caulking material supplied or approved by the EIFS manufacturer. Gaps

greater than 6 mm shall have a transition membrane installed, supported by a backer rod, sealant foam

or similar material. The transition membrane shall be of sufficient width to lap both sides of a gap by a

minimum of 50 mm.

8.1.2 The LA-WRB shall be installed in two coats over the entire substrate to result in the thickness

specified. Allow the LA-WRB to dry before the installation of the second coat or installation of the thermal

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ISO 17738-2:2019(E)

insulation board, except where the second coat of LA-WRB is being used as an adhesive to secure the

thermal insulation board.

Where the LA-WRB is returned into rough openings, the framing members should be made clean and

free from any remnant surface residues of the manufacturing or packaging process.

NOTE Where the second coat of the LA-WRB is being used as an adhesive, the above provision requires that

the first coat be allowed to dry before the second coat/adhesive is applied and the thermal insulation board

installed.

8.1.3 The EIFS contractor shall conduct a pull adhesion test in accordance with ISO 4624 to confirm

that the LA-WRB has adhered after it has cured.

8.1.4 When conditions are outside the parameters described in 4.9 and additional protection is

required for installation (4.10), the substrate temperature shall be maintained at 4°C or higher.

NOTE If the interior of the building is below 4°C then installing insulation with adhesive will keep the

substrate colder than the protected environment. Interior heating can be required to maintain substrate

conditions.
8.2 Transition membrane

8.2.1 The WRBA shall be made continuous at openings, penetrations, joints in the substrate, expansion

joints, working joints, flashings, junctures to fenestration, other wall systems, and junctures with roofing

membranes by using transition membranes.

8.2.2 The WRBA shall maintain continuity at the interface with other cladding systems and/or cladding

components to prevent moisture penetration inward of the WRBA plane.

8.2.3 Where transmission membranes require primers, the primer shall be given sufficient time to

cure before installation of the transition membrane. The primer surface shall not be left exposed beyond

the time specified and the transition membranes shall be installed on the same day as priming. Primed

surfaces not covered by transition membrane on the same day shall be re-primed.

8.2.4 The transition membrane shall be rolled with a membrane roller (also called countertop roller,

laminate roller or floor roller) immediately after placement to ensure continuous adhesion.

8.2.5 Incorporate flashing into the WRBA in a ship-lapped, waterproof manner to direct water to the

exterior of the cladding.
9 Thermal insulation boards
9.1 General

9.1.1 The thermal insulation board shall be not less than 50 mm thick, not including the depth of a

GDDC, prior to rasping.

9.1.2 Some thermal insulation boards are required to be back-wrapped by installing base coat and

glass fibre reinforcing mesh prior to the installation of the thermal insulation boards (see 10.2.2.3).

9.1.3 The thermal insulation board shall be installed with an adhesive or LA-WRB within the maximum

time limit specified after the adhesive or LA-WRB has been installed.
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ISO 17738-2:2019(E)

9.1.4 All terminations in the thermal insulation board shall be wrapped with base coat and glass fibre

reinforcing mesh, as described in 10.2.2.

9.1.5 EIFS mouldings projecting out from the wall’s vertical plane shall be sloped a minimum of 1:2 to

ensure that water drains from the surface, unless:

a) the EIFS moulding is protected by metal flashing or other durable material; or

b) there is an overhang above the EIFS moulding, where the vertical distance between the top of the

EIFS moulding and the underside of the overhang is not more than one quarter of the horizontal

overhang.

9.1.6 EIFS at parapets shall be constructed to include structural blocking to accommodate the proper

support of flashing.
9.2 Attachment of the thermal insulation boards
9.2.1 General

9.2.1.1 Thermal insulation boards shall be installed in such a manner that the continuity of the

drainage cavity is maintained.

9.2.1.2 Thermal insulation boards shall be installed from a level base line with vertical joints staggered

by a minimum of 75 mm, as shown in Figure 1.

9.2.1.3 Thermal insulation boards shall be butted tightly together to minimize gaps between the

boards that would allow adhesive or base coat intrusion between the thermal insulation board edges.

Where gaps occur, they shall be filled as specified in 9.3.1.

9.2.1.4 Thermal insulation board joints at all inside and outside corners shall be interlocked, as shown

in Figure 1.

NOTE 1 Figure 1 is not drawn to scale. It is a schematic only to demonstrate the configuration of the thermal

insulation boards.
NOTE 2 Board edges are interlocked at corners.
Figure 1 — Installation of thermal insulation boards

9.2.1.5 Window corners and similar re-entrant corners shall be cut out of a single thermal insulation

board in an 'L' shape. Thermal insulation boards shall not be butted together to form a re-entrant corner

at openings. Thermal insulation boards shall not be butted together at aesthetic reveals.

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ISO 17738-2:2019(E)

9.2.1.6 Thermal insulation board joints shall be offset at least 150 mm from horizontal and vertical

substrate sheathing board joints.

9.2.1.7 Each thermal insulation board shall be installed by placing it tightly against the adjoining

thermal insulation board without lateral repositioning and minimal vertical repositioning.

9.2.1.8 Apply pressure over the entire surface of the thermal insulation board to achieve uniform

contact and an overall level surface.

9.2.1.9 Mechanical fasteners shall be used as a complement and/or as an alternate to adhesive for

attachment where the substrate does not support adhesive attachment of EIFS.

NOTE Mechanical fastening of the thermal insulation board is outside the scope of this document but can be

required for some conditions. Refer to Annex A for more information.

9.2.1.10 The thermal insulation board shall be occasionally checked for proper contact with the

substrate by removing a piece of thermal insulation board. Proper contact shall be achieved when

approximately equal portions of the adhesive remain on both the substrate and the thermal insulation

board. In cases where the adhesion has been checked, the adhesive shall be removed from the thermal

insulation board and substrate, and reapplied.

9.2.1.11 The thermal insulation board shall remain undisturbed for at least 24 h prior to proceeding

with rasping. Cool, damp weather conditions extend the time necessary for the thermal insulation board

to be bonded sufficiently that rasping will not disrupt the adhesive bond; in such situations, leave the

thermal insulation board undisturbed for a longer period.

9.2.1.12 Proprietary adhesive materials used to reduce the bond cure time shall have been tested to

demonstrate compliance with ISO 17738-1.

9.2.1.13 Architectural profiles shall be achieved using thicker thermal insulation boards or additional

layers of th
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